The peripheral nervous system Flashcards
How many cranial nerves are there
12 cranial nerves
How many spinal nerves are there
31 pars of spinal nerves
cranial nerves are ..
somatic
motor
sensory
or mixed
spinal nerves are…
somatic sensory and motor
- mixed
where do the spinal nerves come from
- the spinal cord
how many cervical spinal nerves are there
8 C1-C8 pairs
how many thoracic spinal nerves are there
12 T1-T12 pairs
how many lumbar nerves are there
5 L1-L5 pairs
how many sacral nerves are there
5 S1-S5 pairs
how many coccygeal nerves are there
1 CO1 pairs
why are there 8 cervical nerves
this is because C1-7 emerge superior to the vertebrae for which they are named
c8 emerges inferior to c7 vertebrae
- below this each spinal nerve leaves the vertebral column inferior to there numbered vertebrae
where do cranial nerves emerge from
the brain and the brainstem
label a cross section of the spinal cord
label it
what are the 3 plexi
cervical C1-C5
brachial C5-T2
lumbar L1-L4
sacral L4-S4
Label the dermatome
DO IT
where does the sciatic nerve originate from
L4 - S3
where does the sciatic nerve pass down
passes down the posterior leg
where does the dermatomes of C5-C8 run down
run down the arm
because the dermatomes c5-c8 run down the arm ..
the dermatome C5 is next to T1 dermatome on the front of the chest
t2-t12 where does it go for the dermatome
goes rough the thorax and abdomen
sacral dermatomes
on buttocks
lumbar dermatomes
on front of legs
what is the peripheral nervous system made up of
cranial and spinal nerves
